This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | -59048 |
| 4 | 1 |
| 5 | 9765626 |
| 6 | -59048 |
| 7 | -282475248 |
| 8 | 1 |
| 9 | 3486725353 |
| 10 | 9765626 |
| 11 | -25937424600 |
| 12 | -59048 |
| 13 | 137858491850 |
| 14 | -282475248 |
| 15 | -576640684048 |
| 16 | 1 |
| 17 | 2015993900450 |
| 18 | 3486725353 |
| 19 | -6131066257800 |
| 20 | 9765626 |
| 21 | 16679598443904 |
| 22 | -25937424600 |
| 23 | -41426511213648 |
| 24 | -59048 |
| 25 | 95367441406251 |
| 26 | 137858491850 |